Wearing plates for crushers



May 11, 1948.

E. T. PETERSON 2,441,205

WEARING PLATES FOR CRUSHERS Filed Aug. 3, 1943 Patented May ll, 1948 UNITED STATES PATENT OFFICE 2,441,205 WEARING PLATES Foa CRUSHERS Edward T. Peterson, Reading, Pa. Application August s, 1943, Serial no. 497,225

4 Claims. (01. 241-300) My invention relates to crushers and more particularly to wearing plates for the jaws of rock and ore crushers.

Because of the extremely severe service to which the wearing plates are subjected, they are customarily made of an alloy steel, such as manganese steel, so as to possess great hardness. Manganese steel is quite expensive and it is, therefore, desirable that the wearing plates be applied to the jaws of the crusher in such manner that they may be used until they are worn so thin as to be rendered practically useless.

Heretofore the manner of connecting the plates to the jaws has been such that after only a relatively small amount of wear of the plates, the securing members become exposed to the down travelling stream of rock or ore and are thus subjected to the same wear as the plates themselves. It has, therefore, been necessary to frequently replace the securing members and, in addition, the plates themselves have had to be discarded and scrapped long before being worn out. The cost of these repair parts, the labor in making the repairs and the time the machine is out of operation on account of repairs has in the past made the maintenance of these machines inordinately expensive.

The principal objects of the invention are to provide wearing plates which are capable of being so mounted on the jaws of a crusher that they may be used until completely worn out and also to provide means for connecting the plates to the jaws which will not be subjected to wear.

A primary feature of the invention consists in providing a wearing plate with lugs projecting rearwardly from the inner face thereof adjacent one edge and in providing means which is spaced inwardly from the outer face of the plate a distance substantially equal to the thickness of the plate for wedgingly cooperating with I the lugs to retain the plate on the jaw.

Another feature of the invention consists in providing a wearing plate having two sets of lugs projecting rearwardly from the inner face thereof adjacent opposite side edges, and in forming the lower portion of the crusher jaw with a downwardly extending flange offset rearwardly from the front face thereof to which members are secured for cooperating with one of the sets of lugs on the wearing plate to secure the plate to the jaw, the outer faces of the members being substantially flush with the front face of the jaw.

Other and more specific features of the invention-residing in advantageous forms, com- 2 binations and relations of parts, will hereinafter appear and be pointed out in the claims.

In the drawings, illustrating a preferred embodiment of the invention.

Figure 1 is a front view of a crusher jaw and wearing plates embodying the invention.

Figure 2 is a vertical sectional view taken on line 2-2 of Figure 1.

Referring more'particularly to the drawings, I indicates a movable crusher jaw which is adapted to swing about a shaft or axle 2 by any suitable mechanism, such, for example, as the toggle mechanism illustrated in my copending applica tion Serial No. 414,895, filed October 13, 1941 (Patent 2,343,322 of March 7, 1944) of which this application is a continuation in part. It will, of course, be understood that the particular crusher jaw shown in the drawings has been chosen for illustrative purposes only and that the invention is not limited in its application thereto but, on the contrary, it is equally applicable to'all types of crusher jaws, both movable and stationary.

The movable jaw illustrated comprises a one piececasting having front and rear walls 3 and 4, respectively, and side walls 5. These Walls are tied together and braced by transversely and longitudinally extending internal webs 6, each of which has core openings which reduce the total weight of the jaw.

The upper portion of the jaw is preferably formed integrally with a hub portion 1 through which the supporting shaft 2 extends. A removable striking plate or shield 8 may be advantageously secured to the upper portion of the law to protect the hub from rocks or other material entering the crusher. The striking plate may be conveniently secured in place by bolts 9 and along its upper edge it may be advantageously provided with a pair of rearwardly projecting. lugs H) which extend into recesses II in the jaw and function to restrain undue lateral shifting of the plate.

Mounted on the front wall 3 of the jaw are a plurality of removable wearing plates whose front faces are preferably provided with vertical corrugations. In the illustrated embodiment of the invention there are six of these plates, arranged in two rows of three each, but it will be appreciated that the jaw may be faced with a fewer number of larger plates or a greater number of smaller plates, as desired.

Corresponding plates in each of the two rows are identical and the 'top and bottom plates, designated by the reference numeral l2, in each row are also identical so that they may be interchanged. Moreover, the top and bottom plates as well as the intermediate wearing plate, designated [3, are each symmetrical so that, in addition to the top and bottom plates being interchangeable with each other, each plate may be turned end for end, that is, each plate may be first used in one position and then turned upside down and continued in use in what may be regarded as an inverted position.

The intermediate wearing plate i3 is connected to the jaw by a plurality of bolts M and to restrain it from shifting laterally it is formed on its inner face wtih aligned ribs l5 which extend within recesses or grooves formed in the front face of the jaw. The top and bottom edges of the intermediate plate l3 converge rearwardly, while the top and bottom edges of the top and bottom plates i2 diverge rearwardly so that the intermediate plate by being arranged in abutting relation with the top and bottom plates functions as a wedge to clamp the contiguous edge portions of those plates to the jaw.

The upper edge portion of each of the top wearing plates is; rigidly clamped to the jaw by a wedge member it which is interposed between the upper edge of the wearing plate and a shoulder l1 formed on the jaw beneath the hub portion thereof. The cooperating faces of the wedge and wearing plate are correspondingly inclined and vthe wedge is firmly secured in place by a plurality of bolts i=8. In addition to being retained on the jaw by the wedge l6 and the intermediate wearing plate 13, the top plate may be also connected to the jaw by a plurality of bolts l9. Auxiliary means such as bolts I90. may also be employed to assist-in retaining the bottom wearing plate on the jaw.

To rigidly clamp the lower portion of the loottom wearing plate to the jaw, the bottom plate is provided, preferably integrally, with a plurality of lugs which project rearwardly from the inner face of the plate adjacent its lower edge. These lugs extend into recesses 2lformed in the front face of the jaw and their lower faces, which are preferably inclined at the same angle to the rear face of the plate as the contiguous lower edge of the plate, are located below portions of the jaw surrounding the lower portions of the recesses so as to be engaged by the retaining means to be described.

Projecting downwardly from the lower portion of the jaw and spaced rearwardly from the front face thereof by an amount which is preferably at least as great as the depth of the recesses 2| is a depending flange 22 having a plurality of laterally spaced ofiset portions 23. Secured to these offset portions are brackets or so-called toe lugs 24 which respectively have wedging engagement with the lower facesof the lugs 28 and thus rigidly clamp the lower portion of the bottom wearing plate to the jaw.

Each of the brackets 24 is preferably connected to the depending flange 22 of the jaw by a plurality of rivets 25 and, in order to relieve the rivets from a substantial part of the shearing strains to which they would Otherwise be subjected, a rib or key 26 is provided on the inner face of each bracket which fits snugly within a recess or groove 21 formed in the outer face tof the offset portion 23 to which the bracket is secured. The distance the outer faces of the offset portions 23 of the bottom flange of the jaw are spaced rearwardly from adjacent portions of the front face of the jaw is such that, considering the thickness of the brackets or toe lugs 24 which must be employed to adequately support the lower plate and, clamp its lower portion, the outer face of the brackets or toe lugs will not be disposed outwardly of the adjacent portion of the outer face of the jaw. Thus the toe lugs or brackets only cooperate with the rearwardly projecting lugs 20 of the lower jaw plate and not with the edge portions of the wearing plate proper to support and clamp it in position and, as the outer faces of the toe lugs are spaced inwardly from the adjacent portions of the outer face of the plate a distance substantially equal to the thickness of the plate, they are protected from the stream of material which passes downwardly across the face of the plates and thus are not subjected to any wear until the bottom plate is completely worn out.

Lugs 20a, identical with lugs 28, are also formed on the rear face of the lower plate adjacent its upper edge so that after the lower edge portion of the illustrated bottom plate has taken all the Wear it can stand, the plate may then be inverted and continued in use with the toe lugs engaging the lugs 20a. In this way, the toe lugs will be protected from wear in both of the two positions in which the plate is capable of being used on the jaw. The top and bottom edges of the upper wearing plate are also formed with rearwardly projecting lugs .23 and 26a so that it may be interchanged with the lower plate but it will be appreciated that the lugs on the upper plate as well as those on the upper edge of the lower plate perform no function until by manipulation of the plates they become the lower lugs of the bottom plate.

The front face of the jaw is formed with recesses ZI'a, into which the lugs along the upper edge of the bottom plate and the two sets of lugs on the upper plate respectively project. These recesses and also the recesses 2| cooperate with the lugs which extend into them to limit undue lateral shifting of the plates on the jaw.

From the foregoing, it will be perceived that simple, reliable and effective means have been devised whereby the wearing plates may be used until completely worn out and that the toe lugs for supportingly cooperating with the lower edge of the bottom wearing plates are effectively prevented from wear. Various modifications in the details of the structure illustrated may, of course, be made without departing from the spirit and scope of the invention as defined in the appended claims.

What I claim is: Y 7

l. A jaw for a crusher including a plurality of reversible wearing plates mounted on the front face of the jaw, lugs projecting rearwardly from the inner face of each of said plates adjacent one edge thereof, recesses in the front face of said jaw for receiving said lugs, separate means secured to the lower portion of said jaw, said means having wedging engagement with the bottom faces of the lugs on the lower edge of the adjacent plate for retaining said plate on said jaw, the outer face of said means being spaced inwardly from the outer face of the adjacent portion of said plate a distance substantially equal to the thickness of said adjacent portion of the plate, and means for maintaining another of said plates on said jaw.

2. A jaw for a crusher including a plurality of reversible wearing plates mounted on the front face of the jaw, two sets of lugs projecting rearwardly from the inner face of each of said plates respectively adjacent opposite edges thereof, either of said plates being adapted to be mounted on the jaw with either one of said sets of lugs adjacent the lower edge of the jaw, recesses in the front face of the jaw for receiving said lugs, separate means secured to the lower portion of the jaw adapted to have wedging engagement with the said set of lugs adjacent thereto for securing the adjacent plate on the jaw, said means being disposed substantially entirely to the rear of the front face of the adjacent portion of the jaw so that it will be free of wear until the lower part of said plate is worn so thin as to be rendered practically useless, and means for securing another of said plates to the upper portion of said jaw.

3. A jaw for a crusher including a plurality of reversible wearing plates mounted on the front face of the jaw, lugs projecting rearwardly from the inner face of each of said plates adjacent one edge thereof, recesses in the front face of said jaw for receiving said lugs, a flange extending downwardly from the jaw inwardly of the adjacent portion of the outer face thereof, means overlappingly secured to the outer face of said flange for engaging said lugs on the lower edge of the adjacent plate to secure said plate to the jaw, the outer face of said means being substantially flush with the inner face of said plate whereby substantially the entire lower part of the plate may be worn away before said securing means is subjected to wear, and means for securing another of said plates on said jaw.

4. A jaw for a crusher including a wearing plate mounted on the front face of the jaw, lugs projecting rearwardly from the inner face of said plate adjacent one edge thereof, recesses in the front face of said jaw for receiving said lugs, means depending from the lower portion of said jaw and offset rearwardly from the front face thereof, and laterally spaced members rigidly secured to said means and respectively having wedging engagement with said lugs for securing the plate to the jaw, the outer faces of said members being disposed inwardly of the outer face of the lower portion of said plate adistance substantially equal to the thickness of said lower portion of the plate.

EDWARD T. PETERSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

